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 Post subject: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 11:42 am 
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Joined: Wed Aug 01, 2018 7:58 pm
Posts: 1128
Current ride: Buell 1125R
Hi Folks,
I've again been looking at the air flow on my 1125r & got to admit that I am astounded by the lack of heat dissipation & cooling on this particular model.
For a start, the rear exhaust runs under the frame/tank cross member clearing this by about 25mm, it also only clears the right side member by 5mm. The rear cylinder head clears both the right & left side frame members by 10mm either side which turns the frame into a radiator. Now this is ok if the frame can cool enough by having plenty air pushed over the cylinder heads & down the inside of the frame. Unfortunately the Ram air ducting system (which only ever comes into effect over 120+mph) effectively blocks air from getting there. The air that is pushed over the engine mainly comes from gap between & the radiator cowls which works ok. At speed, but means as soon as the engine is hot this air is warmed through by the radiators which means instead of cold air for cooling (and Induction if you have the standard air box set up) you get hot air especially if the fans are running (IE in traffic). One bonus is the cowl design which pulls air over the outside surface & onto the frame & Engine which helps. The frame heat also causes petrol to leak out of the tank overflow onto the road, sometimes in front of your rear tyre when left hand cornering if you're unlucky.
The other problem is exiting any hot air (thanks Al1125r).
The problems here are the same Frame/Tank cross member that is being heated by the rear exhaust blocks the air exit. The shock absorber & it's oil chamber which is already being heated by the rear cylinder head with no shield & is bolted directly to the right side frame member also blocks air exit & it gets hot. The seat undertray design effectively directs air down the rear shocker & acts as a buffer to guide hot air down onto the swingarm.
My engine can go from 75 degree to 87 & above whilst in slow moving traffic. My engine also hates being above 80 degrees.
I'm in the process of resolving these issues, some of you have already scoffed at my removal of the useless ram air system, I can't wait to hear what you have to say about my new mods heh heh. I'll post pics when I'm done.

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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 6:23 pm 
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Joined: Fri Jul 20, 2012 11:20 pm
Posts: 1048
Current ride: 2001 X1//TRK 502x
Location: surrey
Get rid of the F...in thing. :D


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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 6:38 pm 
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Joined: Tue May 05, 2009 8:00 pm
Posts: 9689
Current ride: X1 2001 White Riot
Location: southampton
...move to Alaska ;) :hehe:

you have a hot engine mounted in the middle of a petrol tank
generating lots of power & heat.
bit of a design fault lOl

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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 6:58 pm 
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Joined: Thu May 07, 2009 9:27 pm
Posts: 1352
Current ride: XB12s,S1WL, Triumph
Location: Glossop in't th'hills
IBIS wrote:
Get rid of the F...in thing. :D


:yt: get a tuber. It's all hanging out in the breeze on one of those :yup:


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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 8:57 pm 
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Joined: Fri Mar 11, 2016 7:28 pm
Posts: 953
Current ride: 1125r XB12X
Location: South
Jazzy, mines at 20+ thousand miles and there have been problems of course, but never overheating, even in a Brighton traffic jam in 30+ degrees...

What problems do you have above 80??


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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 9:03 pm 
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Joined: Wed Apr 15, 2009 5:17 pm
Posts: 8293
Location: Manchester
Only problems he has are in his head :?

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Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 9:07 pm 
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Joined: Fri Mar 11, 2016 7:28 pm
Posts: 953
Current ride: 1125r XB12X
Location: South
Maz wrote:
Only problems he has are in his head :?



I think that's a prerequisite for Buell ownership, With 2 I am an example. With 7... *cough cough*


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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 9:56 pm 
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Joined: Mon Mar 05, 2018 1:09 am
Posts: 331
Current ride: Xt500 , 1125 CR
Location: Tiddly village near the throbbing metropolis of Rugby
Just to define "overheating",in the car world I believe it is around 120 degrees C. Presuming the correct mix of water and antifreeze and a pressurised system with no leaks.
So an indicated temp of 95 C in traffic jams shouldn't be an issue......however I get anxious when mine rises probably as it seems to escalate in a short time and a certain amount of mechanical sympathy kicks in with all those hot metal bits relying on a thin film of hot oil for their life...having said that it soon drops to "normal" levels once moving and air flow increases.
Maybe JB is trying to slow down that rise of temps when stationary?

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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 10:22 pm 
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Joined: Wed Apr 15, 2009 5:17 pm
Posts: 8293
Location: Manchester
.....or maybe JB is just a knob with too much time on his hands ?

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Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR


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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 11:09 pm 
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Joined: Fri May 22, 2009 6:43 pm
Posts: 2331
Current ride: S1`s
Location: Llanelli South Wales
Do you mean noob ?

noob
/nuːb/
Learn to pronounce
nouninformal
noun: noob; plural noun: noobs

a person who is inexperienced in a particular sphere or activity, especially computing or the use of the Internet.


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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 11:16 pm 
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Joined: Mon Mar 05, 2018 1:09 am
Posts: 331
Current ride: Xt500 , 1125 CR
Location: Tiddly village near the throbbing metropolis of Rugby
:ill:

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Last edited by Ohsteveo on Thu Sep 05, 2019 11:24 pm, edited 1 time in total.

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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 11:23 pm 
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Joined: Mon Mar 05, 2018 1:09 am
Posts: 331
Current ride: Xt500 , 1125 CR
Location: Tiddly village near the throbbing metropolis of Rugby
Ohsteveo wrote:
Maz wrote:
.....or maybe JB is just a knob with too much time on his hands ?

Hahaha...encouraging words if ever I heard them. I guess at least it's his time and his hands.....so crack on. Sometimes it's the only way to learn for some people.....experimentation. As a development engineer I was having this conversation today, one view is that any manufacturer has spent an amount of cash making it the best they can within certain constraints. Some people appreciate this and like to enjoy a machine as it was designed ( that's me) and some like to consider the constraints (cash, time available before production dates, inspiration) have impeded any further developments and enjoy trying to push it for the sake of improvement.

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 Post subject: Re: 1125r Cooling system
PostPosted: Thu Sep 05, 2019 11:35 pm 
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Joined: Wed Apr 15, 2009 5:17 pm
Posts: 8293
Location: Manchester
It was a question, not a statement, thus the ? at the end :?

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Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR


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 Post subject: Re: 1125r Cooling system
PostPosted: Fri Sep 06, 2019 12:01 am 
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Joined: Mon Mar 05, 2018 1:09 am
Posts: 331
Current ride: Xt500 , 1125 CR
Location: Tiddly village near the throbbing metropolis of Rugby
Maz wrote:
It was a question, not a statement, thus the ? at the end :?

Yep, got that.....I reckoned that was one of a few possible answers :roll: the others being, yes,no,maybe... :D

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 Post subject: Re: 1125r Cooling system
PostPosted: Fri Sep 06, 2019 1:39 am 
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Joined: Wed Apr 29, 2009 7:27 pm
Posts: 721
Maz wrote:
.....or maybe JB is just a knob with too much time on his hands ?

I think he should call Erik and tell him where he's going wrong myself. I'm sure he'd be fascinated to learn.

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